#include<iostream>

int main()
{
    using namespace std;
    long long population_world,population_the_UK;
    cout << "Enter the world population:";
    cin >> population_world;
    cout << "Enter the popoulation of the US:";
    cin >> population_the_UK;
    double ratio(((double)population_the_UK / (double)population_world) * 100);
    cout << "The population of the US is" << ratio << "% of the world population." << endl;

    return 0;
}